If a. b and c $\epsilon$ N which one of the following is not true ?

If a. b and c $\epsilon$ N which one of the following is not true ?
1). $\frac{a}{b}$ and $\frac{a}{c}$ => $\frac{a}{b+c}$
2). $\frac{a}{b+c}$ => $\frac{a}{b}$ and $\frac{a}{c}$
3). $\frac{a}{b}$ and $\frac{b}{c}$ = $\frac{a}{c}$
4). $\frac{a}{b}$ and $\frac{a}{c}$ => $\frac{a}{3b+3c}$

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